Blood clot stability and bone formation following maxillary sinus membrane elevation and space maintenance by means of immediate implant placement in humans. A computed tomography study

Publication date: Available online 12 October 2018

Source: Journal of Cranio-Maxillofacial Surgery

Author(s): Elton Gonçalves Zenóbio, Liziany David Cardoso, Leandro Junqueira de Oliveira, Mário Nazareno Favato, Flávio Ricardo Manzi, Maurício Greco Côsso

Abstract

Objective

The present controlled clinical pilot study proposed to assess blood clot contraction and bone neo-formation following maxillary sinus lift (MSL) with immediate implant placement without using grafts using cone beam tomography exams.

Materials and methods

Ten implants were placed in ten patients with a residual bone crest height ≥ 4 and ≤ 7mm, in maxillary premolars or 1^st or 2^nd molars regions, using MSL and immediate implant placement without grafts, by means of the lateral window approach. A resorbable membrane (Bio-Gide®, Geistlich, USA) was used to close the window. Computed tomography images were taken after 15 (T1) and 180 (T2) days to assess the rate of blood clot contraction and bone neo-formation. The images were analysed by OsirixMD software. The Shapiro Wilk test was used to verify the normality hypothesis and the data were submitted to Student's paired t-test.

Results

The mean of bone clot height in mesial, apical and distal area referred to implant, presented 4.77mm, 0.77mm and 5.30mm respectively. The mean measurements of new bone formation presented 2.95mm, 0.44mm and 3.45mm. The height contraction (coagulum/new bone formation), between T1 and T2, presented 38%, 43% and 35% respectively, with a significant statistical value p<0.05.

The volume measurements at T1 presented a mean volume of 0.90cm³ sd± 0.60 cm³ and at T2 a mean volume of 0.75cm³ sd± 0.62cm³, with a significant volume contraction between T1 and T2, p<0.005. The mean blood clot contraction was 16.52% ± 8.60%.

Conclusion

The present study demonstrates consistent bone formation around all assessed implants, although with significant contraction of the blood clot. The need for longitudinal studies to establish a long-term prognosis in different modalities of prosthetic rehabilitation of those implants is strongly suggested.

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